Means for molding biscuits.



PATENTED APR. 14, 1908'.

H. w'. MACKENZIE. MEANS FOR MOLDING BISCUITS.

2 SHEETEPSHEET 1.

APPLICATION FILED DH]. 29 1908.

% Xvi/0x49221450 No. 884,746. PATENTED APR. 14, 1908.

H. W. MACKENZIE.

MEANS FOR MOLDING BISGUITS. APPLICATION FILED 12110.29. 190s.

2 SHEETS-SHEET 2.

HUGH WATSON MACKENZIE, OF EDINBURGH, SCOTLAND.

MEANS FOR MOLDING BISCUITS.

Specification of Letters Patent.

Patented April 14, 1908.

Application filed December 29, 1906. Serial No. 349,938.

T 0 all whom it may concern:

Be it known that I, HUGH WVATSON MAO- KENZIE, a subject of the King ofGreat Britain and Ireland, of 22 Upper Grove Place, Edinburgh, in-thecounty of Edinburgh, Scotland, have invented certain new and usefulImprovements in Means for Molding Biscuits, (for which I have madeapplication for a patent in Great Britain, No. 1,891, bearing dateJanuary 25, 1906,) of which the following is a specification.

In manufacturing drop biscuits it is common to produce the biscuit format a single operation by extruding a definite quantity of dough througha die; and in manufacturing molded biscuits it has been proposed toextrude dough into a receiver'and to then impress it to produce thebiscuit form, after which it is ejected for baking; further, in dealingwith some plastic materials, it has been proposed to employ a moldformed in two sections, provided with an inlet passage to permit thematerial tobe introduced into the mold under pressure when the twosections are assembled, producing a closed mold, but in these cases arunner or projection has been produced upon the molded form by reason ofthe inlet passage constituting an extension of the molding area.Sectional molds of this character may for convenience of reference, bedesignated closed molds.

This invention relates to the manufacture of molded biscuits and thelike, hereinafter referred to as biscuits, and the object in view is toproduce an improved closed mold of sectional construction formed with asupply aperture fitted with a controlling .valve, adapted, when openedto permit dough to be extruded into the mold and when closed, to closethe supply and cut off the supply passage so that it forms no part ofthe moldin area; and further to produce an improve construction ofsectional mold with the object of facilitating the subsequent ejectionof the molded form.

According to this invention a mold of compound formation is employedhaving a supply aperture fitted with a controlling valve, which, whenopened, While the composing elements are assembled forming a closedmold, permits dough to be extruded into and take the form of the mold,after which the valve is closed, the sections of the mold separated, andthe biscuit form ejected.

In the accompanying drawings some examples of the construction of moldsaccordin to this invention are indicated.

In the drawings Figures 1 and 2, are part sectional side elevationsillustrating the elements of a mold assembled. Fig. 3, is a similarillustration of the elements separated. Fig. 4, shows a detail. Figs. 5and 7 are inverted plan views, and Figs. 6 and 8 are respectivelycorresponding part sectional side elevations of modified forms ofconstructions. Figs. 9 and 11 are part sectional side elevations offurther modifications, and Fig. 10, is a cross sectional view of Fig. 9.

The form of mold illustrated in the draw ings consists of threeelements, namely, a base plate, A, an open frame, B, and a cover, C.- Inarrangement,'the frame, B, is adapted to lie upon the base plate, A, andthe cover, 0, to rest upon the frame, B, the three, when assembled,forming a closed mold. The cover, C, constitutes the terminal end of adough feeder, D, which, as illustrated at Fig. 1, consists of a doughsupply hopper, D from which dough may be fed into a chamber, D and beperiodically forced forward by a reciprocating piston, D

Referring to Figs. 1, 2, and 3, of the drawings, a construction of moldis illustrated suitable for producing ring biscuits, in which a pistonvalve, E, is fitted to control the ter minal end of the dough feeder, D.The frame, B, is preferably formed with eaves, B projecting inwards fromits top edge, so as to strip the molded biscuit form off the cover, C,as the cover and frame separate, as will be understood from thefollowing description. In some cases, this action may be assisted byadopting means, such as are illustrated at Fig. 4, in which a springactuated ejector ring, F, is fitted, within the sphere of action of theeaves, B which is pressed inwards in the operation of closing the mold.In action, with the parts assembled as shown at Fig. 1, upon opening theterminal end of the dough feeder, D, by lowering the valve, E, so thatit rests upon the base plate, A, in which position it forms a centralcore to the mold, as shown at Fig. 2,

, the piston, D is advanced, by any suitable mechanism, so that doughunder pressure is forced into and fills the mold, after which the valveis closed and the piston, D retracted. The base plate, A, and frame, B,may now be lowered together, while the cover remains stationary; or thecover, C,

'may be raised while the base plate and frame remain stationary. Thecharged frame may then be slid over or raised from the base plate into aposition for the ejection of the molded form, while permit ting anotherframe to be brought into the charging position. The illustration Fig. 3,represents the frame in position for the ejection of the molded biscuitform, which may subjected to a preliminary sid'ef movement,

to be followed by the actions in the order as above described. In somecases it may be found desirable to heat the base plate, A, or impart acontinuous sliding movement to it during the process of charging.

In the example of construction shown at Figs. 5 and 6, the terminal endof the dough feeder, D, is controlled by a valve, E, mounted in a guide,C depending from the cover, 0. A "corresponding recess is formed in theframe, B, to receive the guide, C, and a way, A is cut in the base plateto permit the valve to descend. \Vith the elements of the mold and valvein the positions shown, the contour of the frame where recessed iscompleted by the inner faces of the guide, C in conjunction with theface of the valve, E. The action in this case is similar to that abovedescribed, in that when the valve descends the dough is free to passinto the mouldv The molds can be fitted with pins, G, which may besecured in the cover, C, for producing perforated biscuit forms. Forconvenience of illustration, pins, G, have been shown in Figs. 5, and 6;and afurther example is illustrated at Figs. 7 and 8, in which case theeaves, B are formed with inwardly projecting tongues and some of thepins,G, are arranged to pass through holes formed therein.

In lieu of vertically operating valves, horizontally sliding valves suchas, H, as indicated at Figs. 9 and 10, or an oscillatory valve, such as,J, as indicated at Fig. 11, may be fitted in the cover, C. In theseconstructions it will be noted that the closure faces of the valves arearranged to effect a clean cut off on the surface of the biscuit form.

It will be understood that the interior surfaces of the cover and baseplate may be engraved, and the valve and frame may be of varying shapesto produce ornamental biscuits of different designs.

What I do claim as my invention, and desire to secure by Letters Patent,is

1. A mold of compound formation, having a supply aperture fitted with acontrolling valve adapted when closed to complete the contour of themolding area while cutting off the supply passage from the mold,substantially as described.

2. A mold of compound formation, consisting of a base plate, an openframe, and a cover, and having a supply aperture fitted with acontrolling valve arranged perpendicularly to the cover and set at theside thereof, substantially as and forthe purposes set forth.

3. A mold of compound formation, consisting of a base plate, an openframe, and a cover provided with pins, and having a supply aperturefitted with a controlling valve, substantially as and for the purposesset forth.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

HUGH WVATSON MACKENZIE.

W itnesses AROHD. J. TORRANCE, A. HARRowEn.

